Comprehensive Technical Parameter Report for 20-Ton Single Girder Gantry Crane

The following is a comprehensive report on the technical parameters of a 20-ton single girder gantry crane, compiled based on search results and incorporating key data and design specifications from multiple sources for reference.

I. Basic Parameters

1. Rated Lifting Capacity: 20 tons (main hook), some models are equipped with an auxiliary hook (e.g., 5-ton auxiliary hook).
2. Work Class: A3-A6, commonly A3 (moderate duty cycle).
3. Span: Customizable, standard range is 10-35 meters, common specifications are 17 meters, 18 meters, and 20 meters.
4. Lifting Height: Standard 6-12 meters, can be customized up to 30 meters for special requirements.

II. Operational Performance

1. Lifting Speed:
   • Main Hook: 8-9.8 m/min (electric hoist driven).
   • Auxiliary Hook (if equipped): Speed slightly higher than the main hook.
2. Gantry Travel Speed: 30-36 m/min (for rail types P38/QU80).
3. Trolley Travel Speed: 15-32 m/min.

III. Structural Design

1. Main Girder Type:
   • Single girder design (L-type or MH-type), material mostly Q345B high-strength steel, light self-weight, low wheel pressure.
   • Box-type structure (MH-type), good overall rigidity.
2. Rail Requirements:
   • Rail height difference ≤ 12 meters, levelness must be ensured.
   • Gantry rail types P38 or QU80.

IV. Electrical & Control

1. Power Supply: Three-phase four-wire 380V/50Hz, powered by festoon system or cable reel.
2. Operation Mode:
   • Mainly floor control (pendant), optional cabin control or wireless remote control.
3. Safety Devices:
   • Limit switches, overload protection, emergency braking system.

V. Environmental Adaptability

1. Operating Temperature: -20℃ to +40℃, suitable for open storage yards, railway lines, and other scenarios.
2. Windproof Measures: Some models require added rail clamps or anchor devices (for outdoor use).

VI. Customization Options

1. Span and Lifting Height: Adjustable according to user requirements, providing workshop dimensions or operational scene data is necessary.
2. Additional Functions:
   • Electromagnetic lifter or dual-purpose hook design.
   • Auxiliary boom extension (for special working condition requirements).

VII. Compliance Standards

Design complies with the following specifications:

• “Crane Design Code” (GB3811-2008).
• “Safety Code for Lifting Appliances” (GB6067-2009).
• Special Equipment Manufacturing License (certification required for lifting capacity ≥ 3 tons).

Summary

The technical parameters of the 20-ton single girder gantry crane need to be customized according to the actual application scenario (such as storage yards, railways, workshops), with focus on span, lifting height, work class, and operation mode. It is recommended to confirm details (such as windproof, anti-corrosion design) with the manufacturer based on specific requirements.